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The exterior of a 787 Dreamliner at the Boeing manufacturing facility in North Charleston, on December 13, 2022. 

A Boeing engineer-turned-whistleblower who contends that the aerospace giant's 787 Dreamliner is unsafe to fly due to assembly flaws doubled down on his claims Tuesday, saying that the plane could fall apart and "drop to the ground" midflight unless the alleged safety problems are addressed. 

Boeing disputed the claims on Tuesday, saying the plane is safe and the company is "fully confident in the 787 Dreamliner."

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